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Hearth outlet NOx prediction method and system based on numerical simulation

A furnace outlet and numerical simulation technology, applied in CAD numerical modeling, measuring devices, instruments, etc., can solve the problems of NOx concentration measurement lag and inaccuracy, and achieve the effect of improving economy and denitrification efficiency

Pending Publication Date: 2022-03-25
SOUTHEAST UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method and system for predicting NOx at the furnace outlet based on numerical simulation, aiming at solving the problem of hysteresis and inaccuracy in NOx concentration measurement, predicting NOx emissions from the combustion process, thereby improving ammonia injection control Effect

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  • Hearth outlet NOx prediction method and system based on numerical simulation
  • Hearth outlet NOx prediction method and system based on numerical simulation
  • Hearth outlet NOx prediction method and system based on numerical simulation

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Embodiment Construction

[0056] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0057] Such as figure 1 As shown, a numerical simulation-based furnace outlet NOx prediction system in this embodiment includes a prediction model part and a real-time prediction part, and the prediction model part includes a DCS data processing unit 101, a calculation simulation unit 102, a database unit 103 and a NOx prediction model The establishment unit 104, the real-time prediction part includes the furnace actual working condition acquisition unit 105 and the NOx prediction unit 106;

[0058] The DCS data processing unit 101 is used to extract the furnace combustion boundary conditions required for the numerical simulation calculation from the DCS system (Distributed Control System, DCS) of the coal-fired power station distributed control system;

[0059] The calculation and simulation unit 102 is used to perform numerical simulation calcula...

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Abstract

The invention relates to a hearth outlet NOx prediction system based on numerical simulation. The hearth outlet NOx prediction system comprises a prediction model building part and a real-time prediction part. The invention also relates to a prediction method which comprises the following steps: processing DCS data, obtaining boundary conditions required by numerical simulation calculation, establishing a three-dimensional geometric model of a hearth, calculating NOx concentration data of a hearth entrance under different working conditions, and determining a database; according to the database, establishing a hearth outlet NOx prediction model by adopting a support vector method; and finally, predicting the NOx concentration at the outlet of the hearth in real time according to the real-time inlet parameters of the hearth under the actual working condition. The method can predict the change of NOx at the outlet of the hearth and the distribution of NOx in the furnace when the combustion condition changes, namely the operation parameters of air / powder and the like are adjusted, can guide SCR ammonia injection in advance, and has important significance for improving the denitration efficiency of a coal-fired power plant, the operation safety of an air pre-heater and the economical efficiency.

Description

technical field [0001] The invention relates to the technical field of NOx prediction at the furnace outlet of a coal-fired boiler, in particular to a method and system for predicting NOx at the furnace outlet based on numerical simulation. Background technique [0002] At present, coal-fired power plants mainly use selective catalytic reduction (SCR) flue gas denitrification technology to control NOx emissions, and use reducing agents (NH3 or urea, etc.) to selectively convert NOx in flue gas into N 2 and water. However, the SCR flue gas denitrification ammonia injection control is difficult to adapt to the large and frequent changes in AGC load instructions and deep peak regulation requirements, which often leads to excessive ammonia injection and ammonia escape rate exceeding the standard, resulting in blockage and corrosion of air preheater components. The main reasons include: the hysteresis and low accuracy of flue gas NOx concentration measurement are important facto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G01N33/00G06F111/10G06F119/08
CPCG06F30/28G01N33/0037G06F2111/10G06F2119/08
Inventor 赵伶玲尚碧沉
Owner SOUTHEAST UNIV
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